Abstract
Due to the advantage of saving indoor space, a special-shaped column frame attracted more attention of the engineers and researchers. This paper presented a quasi-static cyclic loading experiment of six specimens of reinforced concrete (RC) L-shaped columns under compression-flexure-shear-torsion combined loadings to investigate the effect in the ratio of torsion to moment (T/M) and axial compression ratio (n) on their seismic performance. The results showed that the failure modes of L-shaped specimens included bending failure, bending-torsion failure, and torsion-shear failure with the hysteretic curves exhibiting S shape. With the increase of T/M ratio, cracks on the flange developed more fully, and the height of plastic hinge decreased and torsion bearing capacity improved. Besides, as the T/M ratio increased the twist ductility increased, while displacement ductility decreased. On the other hand, with a higher axial compression ratio, torsion bearing capacity and bending stiffness were both increased. Moreover, the equivalent viscous damping coefficient of bending and torsion were 0.08~0.28 and 0.13~0.23, respectively. The average inter-story drift ratio met the requirements of the Chinese standard. Finally, two modified models were proposed to predict the progression of damage for the L-shaped column under combined loading including torsion.
Highlights
Compared with traditional rectangle columns, the special-shaped (L, T, +) columns have advantages of refraining from the wall, increasing the interior space, and improving the flexibility in the use of architectural space, due to the limb of the special-shaped column as thick as the wall.it is favored deeply by buyers and architects [1,2]
Great efforts have been taken to reveal the seismic performance of reinforced concrete (RC) special-shaped columns under axial force and bending load or bending and shear force
It is necessary to investigate the seismic performance of RC special-shaped columns subjected to the combined loading including axial compression, shear, moment, and10,torsion
Summary
Compared with traditional rectangle columns, the special-shaped (L, T, +) columns have advantages of refraining from the wall, increasing the interior space, and improving the flexibility in the use of architectural space, due to the limb of the special-shaped column as thick as the wall. It is necessary to investigate the seismic performance of RC special-shaped columns subjected to the combined loading including axial compression, shear, moment, and10,torsion. Addition, great efforts been taken the seismic of concrete-filled circular/rectangular steel tube columns under combined to reveal theperformance seismic performance of RC special-shaped columns under axial force and bending load torsion. They bending decreased with increasing of T/M while the or bending andfound shear that force.the. It is necessary investigate the aseismic performancemodel of RC of members subjected to combined torsion They used the model to assess the seismic performance, special-shaped columns subjected to the combined loading including axial compression, shear, which alsoand matched moment, torsion.the experimental results well. Two decoupled flexural and torsional damage index models were proposed to predict the progression of damage for the L-shaped column under combined loadings
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